New to SmartThings, need some help

[RBoy (www.rboyapps.com - Making SmartThings Easy!)]

@TheBeachHouse

I’m having difficulty wrapping my head around how to make the system figure out if people have locked up and left or whether people are still there

Well apart from the suggestions about about CoRE and using sensors to detect motion and create a rule which are awesome ideas, one simple way that was designed into the SmartApp itself was action based on external lock.
Some locks like the Schlage BE469 and Yale YRD2x0 series have the ability to “lock” the deadbolt from outside using the keypad or a code. You will need to use the Universal Z-Wave DH to enable/use that feature if your lock supports that feature in conjunction with the SmartApp and now you configure the SmartApp to change modes/run routines when it detects that the lock has been locked from the outside.

[RELEASE] Universal Enhanced Z-Wave Lock Driver for Schlage, Yale, Kwikset, IDLock, Popp, Danalock, August Pro, Keywe, Philia, Samsung

A “future proof” Universal Enhanced Z-Wave Lock driver This driver is enhanced to fix bugs in the stock ST ZWave Lock driver, include patches for bugs in lock firmwares and bring out additional features for Schalge, Yale, Kwikset, IDLock, Popp, Samsung, Delaney, August Pro, Danalock, KeyWe, Philia, Vivint, Locstar etc zwave locks (see below for a full list of models and features). This works with all ZWave locks and newer ZWave Plus locks (see below for a list of locks tested). It discovers/learns the lock features and automatically configures them. If a feature is not supported by the lock it will not show up or say Unsupported. You need SmartThings Smart Lock Guest Access (SLGA), Advanced Web UI or a SmartApp like Lock User Management (LUM), Rental Lock Automater (RLA) to program user …

However this would require you to tell your maids/guests to press the lock button when they are leaving. Not as easy as it sounds rights